WO2001090538A1

WO2001090538A1 - Valve lift adjusting device

Info

Publication number: WO2001090538A1
Application number: PCT/JP2000/003296
Authority: WO
Inventors: Masafumi Sugawara
Original assignee: Mitsubishi Denki Kabushiki Kaisha
Priority date: 2000-05-23
Filing date: 2000-05-23
Publication date: 2001-11-29
Also published as: DE60027607T2; EP1284341B1; EP1284341A4; US6457445B1; EP1284341A1; DE60027607D1

Abstract

A valve lift adjusting device, comprising an inner tappet energized toward a low lift cam installed on a cam shaft rotationally driven in synchronous with the rotation of an internal combustion engine, an outer tappet installed on the outside of the inner tappet and energized toward a high lift cam, and a projected member projected at at least one or more positions and a rotating member rotatable relative to the circumferential directions of the inner and outer tappets and having an engagement part with the projected member, both provided on the outer periphery of the inner tappet, whereby a relative sliding of the inner tappet to the outer tappet in axial direction is limited or allowed depending on the rotation of the rotating member within a specified range.

Description

Description Valve lift adjustment device Technical field

The present invention relates to a valve lift adjusting device for adjusting a lift of an internal combustion engine such as an engine when the intake valve or the exhaust valve is opened and closed by a cam via an evening according to the operating conditions of the engine. Things. Background art

In general, in a valve drive system of an internal combustion engine, the valve lift and the angle of inclination are both reduced in the low rotation range to increase the flow rate of the air-fuel mixture to improve the combustion efficiency, while the valve lift and the reduction in the high rotation range. By increasing the burlap and using the effect of exhaust inertia to increase the suction efficiency, the internal combustion engine achieves low fuel consumption and high output.

In such a valve drive system, as a valve lift adjusting device usually used together with a valve opening / closing timing adjuster, for example, the one disclosed in Japanese Patent Application Laid-Open No. 10-5072242 is disclosed. Are known.

This valve lift adjusting device is composed of a plurality of cams provided in a shaft which is driven to rotate in synchronization with the rotation of the internal combustion engine, and a low-rotation range (corresponding to a port-lift mode) of these cams. An inner pet that reciprocates in the axial direction of the valve port in accordance with the profile of the low lift cam that is involved in opening and closing the valve, and an outer pet that is provided outside of the inner pet An outer sunset that moves back and forth in the axial direction of the valve rod according to the cam profile of a high-lift cam that is involved in opening and closing the valve in the high rotation range (equivalent to high lift mode). In the inner night set, the inner It has a moving member arranged to be movable in the radial direction of the sunset.

This moving member is moved radially outward of the inner set by the hydraulic pressure supplied to the center of the inner set in a high-lift mode. The two pets are integrated by engaging the concave part on the inner periphery of the pet, and in low-lift mode, the hydraulic pressure is reduced and the inner parts are set by urging means such as springs. The two sets are separated from each other by being returned inward in the radial direction of the set and being removed from the above-mentioned set.

However, in the conventional valve lift adjusting device, the hydraulic pressure required to engage the moving member with the concave portion of the outer sunset must be supplied to the central portion of the inner sunset. The structure of the hydraulic system was complicated, and there were concerns about operational reliability.

In addition, Japanese Patent Application Laid-Open No. H10-140130 discloses the same technology as the above-mentioned publication.

The present invention has been made to solve the above-described problems, and has as its object to obtain a valve head adjustment device having a simple structure and excellent operation reliability. Disclosure of the invention

A valve lift adjusting device according to the present invention is a port lift cam that is involved in opening and closing a valve in a low lift mode among a plurality of cams provided in a cam shaft that is driven to rotate in synchronization with the rotation of an internal combustion engine. And a cam provided outside the inner cam and engaged in closing the valve in a high-lift mode among the plurality of cams. An outer socket biased toward the lift cam, a protruding member projecting at least at one or more locations on the outer periphery of the inner set, and the inner set and the outer set. A A rotating member which is relatively rotatable in the circumferential direction of the outer set and has an engaging portion with the protruding member, and the inner member is rotated by rotating the rotating member within a predetermined range. It is characterized in that relative sliding in the axial direction between the one set and the outer set is restricted or permitted. This makes it possible to easily switch between the valve lift in the low rotation range and the valve lift in the high rotation range with a simpler structure than the conventional valve lift adjustment device. Can improve operation reliability and stability.

The valve lift adjusting device according to the present invention is characterized in that the projecting member is a rod-shaped member projecting to the outer periphery of the inner set. Thus, the rod-shaped member as the protruding member is protruded from the outer periphery of the inner set, whereby the engagement with the engaging portion of the rotating member or the release thereof can be reliably performed.

In the valve lift adjusting device according to the present invention, a rod-shaped member is radially penetrated into the inner set, and at least one end face is formed from the outer peripheral surface of the inner set. It is characterized by being projected outward in the radial direction of the pet overnight. As a result, the rod-shaped member as the protruding member is protruded radially outward from the outer periphery of the inner socket, so that the engagement or disengagement of the rotating member with the engaging portion is ensured. Can be done.

The valve lift adjusting device according to the present invention is characterized in that the rotating member can be moved in one circumferential direction of the inner and outer sunsets by hydraulic pressure. is there. Thus, the rotation member can be smoothly moved to lock the rod-shaped member.

The valve lift adjusting device according to the present invention is characterized in that the rotating member can be moved in the other circumferential direction of the inner and outer sunsets by a mechanical biasing force. It was done. Thus, the lock on the rod-shaped member can be released by reliably moving the rotating member. The valve lift adjusting device according to the present invention is characterized in that the rotating member can be moved in both circumferential directions of the inner and outer sunsets by hydraulic pressure. . Thus, the rotation member can be smoothly moved to lock the rod-shaped member and release the lock.

The valve lift adjusting device according to the present invention is characterized in that the rotary member is provided with a concave portion that engages with the projecting member. Thus, in the unlocked state of the rotating member to the protruding member, the sliding stroke in the axial direction between the inner pet and the outer pet can be guaranteed.

The valve lift adjusting device according to the present invention is characterized in that the projecting member is provided with a flat portion as a contact surface with the rotating member. This makes it possible to stabilize the contact between the rotating member and the protruding member.

In the valve lift adjusting device according to the present invention, at least one end of the protruding member protrudes radially outward of the outer sunset from an outer peripheral surface of the outer sunset and the outer sunset. It is characterized in that it engages with a groove formed in the sliding direction of the inner peripheral surface of the circumferential hole of the cylinder head that slidably supports the nut. This makes it possible to regulate the free rotation of the inner and outer sunsets.

In the valve lift adjusting apparatus according to the present invention, the edge of the contact surface of the inner pet with the low lift force is located outside the trajectory of the cam profile of the low lift cam and from the low lift cam. It is characterized in that it is provided at a separated position. This can prevent the low lift cam from contacting the edge of the contact surface with the mouth lift cam of the inner pet, so that the mouth lift cam inner Smooth sliding on the evening pet can be guaranteed.

In a valve lift adjusting device according to the present invention, a rotating member has a sector shape, and at least one or more rotating members are disposed in a bobbin-shaped holder, and a peripheral member is provided. 2. The valve lift adjusting device according to claim 1, wherein the valve lift adjusting device is held so as to be rotatable in a direction. With this configuration, since the rotating member has a fan shape, the rotating member can be easily rotated in the holder, so that the hydraulic response can be improved.

The valve lift adjusting device according to the present invention is characterized in that a stopper for restricting a turning range of the turning member is provided in a part of a groove of a holder having a bobbin shape. As a result, the rotation range of the rotation member can be restricted, so that the relative sliding in the axial direction between the inner ring and the lower ring can be reliably restricted. Can be.

The valve lift adjusting device according to the present invention is characterized by having a torsion spring for urging the rotating member in one circumferential direction. As a result, when the rotation of the rotating member is dependent on the hydraulic pressure, the rotating member is rotated by the mechanical biasing force of the torsion spring even if the hydraulic pressure is not supplied when an abnormality occurs. And switch to a safer direction.

The valve lift adjusting device according to the present invention includes a detachable sliding-resistant member that forms a contact surface with a mouth-lifting force of an inner pet and has a detachable sliding-resistant member attached to the inner pet. It is characterized by having been provided. With this, it is possible to guarantee circular sliding of the low lift cam with respect to the inner set. A rotation position restricting means for restricting the relative rotation position is provided. By this, the inner member is formed by the high lift cam due to the slip-resistant member crossing the rotation path of the high cam. This can prevent malfunction of the kit.

The valve lift adjusting device according to the present invention is characterized in that the outer sunset separated from the contact surface of the outer sunset with the high-lift cam by a sliding-resistant member. It is characterized by covering the part. As a result, it is possible to guarantee smooth sliding of the mouth lift cam with respect to the inner set and smooth sliding of the high lift cam with respect to the inner set. In the valve lift adjusting device according to the present invention, the anti-sliding member is accommodated in a groove formed in a part of the outer sunset separated from the contact surface of the outer sunset with the high lift cam. In addition, the contact surface of the anti-sliding member is flush with the contact surface with the high-lift cam of the gear set. This allows the high cam and the low cam to have the same base circle diameter in the camshaft.

A valve lift adjusting device according to the present invention provides a low lift cam that is involved in opening and closing a valve in a mouth lift mode among a plurality of cams provided in a cam shaft that is driven to rotate in synchronization with the rotation of an internal combustion engine. An inner pet that is urged toward the inner cam and a high reflex that is provided outside the inner pet and that is involved in opening and closing a valve in a high relieve mode among the plurality of cams. The outer sunset biased toward the tocum, and the above-described inner evening within the stroke corresponding to the difference between the lift by the low lift cam and the lift by the high lift cam. A rod-shaped member allowing relative sliding in the axial direction of the inner and outer sets, and moving in one circumferential direction of the inner and outer sets. To lock the rod-shaped member A rotating member that regulates relative sliding of the sunset and the outer sunset in the axial direction; and a rod-shaped member that is provided outside the inner sunset and is formed by the rotating member. And a hydraulic mechanism for releasing the lock. As a result, it is not necessary to supply oil pressure to the inside of the inner unit, the structure of the device can be simplified, and the operational reliability and stability of each component can be improved. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a vertical sectional view showing a relationship between a force and a sunset at a base cycle position of the valve lift adjusting device according to Embodiment 1 of the present invention.

FIG. 2 is a plan view of the valve lift adjusting device shown in FIG.

FIG. 3 is a cross-sectional view taken along the line IV-IV in FIG.

FIG. 4 is a perspective view showing the appearance of the valve lift adjusting device shown in FIGS. 1 to 3.

FIG. 5 is an exploded perspective view of FIG.

Fig. 6 (a) to Fig. 6 (c) and Figs. 7 (a) to 7 (c) show the relationship between cam and sunset in low-lift mode over time. FIG. 7 is a sectional view taken along lines VI-VI and VII-VII of FIG.

FIG. 8 is a longitudinal sectional view of the valve lift adjusting device showing a state where the pulp is lifted according to the cam profile of the mouth lift cam.

FIG. 9 is a perspective view showing an appearance of the valve lift adjusting device shown in FIG. FIG. 10 is a longitudinal sectional view showing the valve lift adjusting device in the high lift mode.

FIG. 11 is a perspective view showing the appearance of the valve lift adjusting device shown in FIG.

FIG. 12 is a cross-sectional view taken along line XII-XI of FIG.

Figs. 13 (a) to 13 (c) and Figs. 14 (a) to 14 (c) show the relationship between the cam and evening pet over time in the high-lift mode. 10 is a sectional view taken along lines XIII-XIII and XIV-XIV in FIG.

FIG. 15 is a longitudinal sectional view of a valve lift adjusting device according to Embodiment 2 of the present invention. FIG. 16 is a cross-sectional view of a valve lift adjusting device according to Embodiment 3 of the present invention.

FIG. 17 is a longitudinal sectional view of a valve lift adjusting device according to Embodiment 4 of the present invention.

FIG. 18 is a plan view showing the appearance of the valve lift adjusting device shown in FIG.

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FIG. 19 is a sectional view taken along the line XIX—XIX of FIG.

FIG. 20 is a sectional view showing a rotating member in the valve lift adjusting device according to Embodiment 5 of the present invention.

FIG. 21 is a cross-sectional view showing a holder that allows the rotation of the rotation member shown in FIG.

FIG. 22 is an enlarged sectional view of the holder shown in FIG. FIG. 23 shows the pivoting member and the protruding member in the valve lift adjusting device shown in FIG. 20 in the free state in which the engagement is released.

FIG. 3 is a cross-sectional view taken along the line XXII.

FIG. 24 is a cross-sectional view showing the rotating member and the projecting member in the valve lift adjusting device shown in FIG. 20 in the engaged locked state. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, in order to explain this invention in greater detail, the preferred embodiments of the present invention will be described with reference to the accompanying drawings.

Embodiment 1

FIG. 1 is a longitudinal sectional view showing a relationship between a cam and a sunset at a base cycle position of the valve lift adjusting device according to Embodiment 1 of the present invention, and FIG. 2 is a valve sectional view shown in FIG. FIG. 3 is a plan view of the lift adjusting device, FIG. 3 is a cross-sectional view taken along the line IV-IV of FIG. 1, and FIG. 4 is a valve lift shown in FIG. 1 to FIG. FIG. 5 is a perspective view showing the appearance of the adjusting device, FIG. 5 is an exploded perspective view of FIG. 4, and FIGS. 6 (a) to 6 (c) and FIGS. 7 (a) to 7 Figure (c) is a sectional view taken along the lines VI-VI and VII-VII in Fig. 1 showing the relationship between the cam and the sunset in the mouth-lift mode over time. FIG. 9 is a longitudinal sectional view of the valve lift adjusting device showing a state in which the valve is lifted according to the cam profile of the footcam. FIG. 9 is a perspective view showing an appearance of the valve lift adjusting device shown in FIG. FIG. 10 is a longitudinal sectional view showing the valve lift adjusting device in the high lift mode, and FIG. 11 is a perspective view showing the appearance of the valve lift adjusting device shown in FIG. FIG. 12 is a sectional view taken along the line XII—XII of FIG. 10, and FIG. 13 (a) to FIG. 13 (c) and FIG. 14 (a) to FIG. Figure (c) shows the high lift mode. FIG. 10 is a sectional view taken along line XIII-XIII and XIV-XIV in FIG. 10 showing the relationship between the cam and the evening pet at a time. In the drawings, the camshaft side is referred to as the upper side and the valve side is referred to as the lower side for convenience.

In the figure, 1 is a cylinder head of an internal combustion engine (not shown), 2 is an intake valve or an air valve (hereinafter, simply referred to as a valve) provided in the cylinder head 1, and 3 is a valve 2 4 is a camshaft that is driven in synchronization with the rotation of the internal combustion engine, 5 is a valve shaft that is fixed to the camshaft 4 and adjusts the valve lift in a low-lift mode corresponding to the low engine speed range of the internal combustion engine. The low lift cam 6 is fixed to both sides of the mouth lift cam 5 fixed to the cam shaft 4 and the valve lift is adjusted in the high lift mode corresponding to the high rotation range of the internal combustion engine. A pair of high lift cams 7 is a base circle having a perfect circular cross section as a reference for the low lift cams 5 and the high lift cams 6. As shown in FIG. 3, the cam profile of the mouth lift cam 5 has a first raised portion 8 in a part of the base circle 7, and the cam profile of the high lift cam 6 is a base member. Part 1 of Cru 7 It has a second raised portion 9 larger than the raised portion 8.

Numeral 10 denotes an inner nozzle that can reciprocate along the axial direction of the valve port 3. The inner portion 10 has a disk-shaped top portion 10a that contacts the cam profile of the high lift cam 6, and a body portion 10b having a smaller diameter than the top portion 10a. It is a cylindrical member, and a through hole 10c for accommodating a rod-like member described later is formed on the outer peripheral surface at a point symmetrical position with respect to the center on the axis of the inner socket 10 as a reference. ing. The outer socket 11 is coaxial with the inner socket 10 so that it can reciprocate along the axial direction of the valve rod 3 outside the inner socket 10. It is provided. The outer socket 11 has a central housing hole 11a for accommodating the inner housing 10 described above and a lift cam which surrounds the central housing hole 11a and has 5 is a substantially cylindrical member having an annular upper surface 11b contacting the cam profile 5 and a lower opening 11c, and is slidable into the cylindrical hole 1a in the cylinder head 1. Is housed in On the outer peripheral surface of the outer socket 11, a pair of through-holes 1 1d for accommodating a pin described later with the through-hole 10c of the inner socket 10 protruding outward. Are formed. The through-hole 11 d of the outer housing 11 is different from the cross-sectional shape of the through-hole 10 c of the inner housing 10, and has a longer cross-sectional shape in the axial direction of the valve port 3. The stroke is equivalent to the head difference between low lift cam 5 and high lift cam 6. Further, a hydraulic pressure supply port 11 e connected to a hydraulic port described later is formed on the outer peripheral surface of the outer evening pet 11. 1 2 penetrates through hole 10 c of inner set 10 and through hole 1 1 d of outer set 11 and prohibits relative rotation of both sets. It is a pin as a rod-shaped member.

13 is coaxially accommodated in the outer sunset 11 through the lower opening 11c of the outer sunset 11 and includes a rotating member to be described later. This is a substantially cylindrical case disposed between the first case and the second case. The case 13 has an open top structure that does not have an upper wall, as opposed to the outer evening pet 11, and has an outer peripheral wall 13 a and an inner peripheral wall provided inside the outer peripheral wall 13 a. A circumferential switching vane receiving groove 15 is constituted by 13 b and an intermediate bottom portion 13 c sandwiched between these peripheral walls. The case 13 has a connecting wall 13 d extending from a part of the outer wall 13 a radially inward of the case 13 and connecting the outer wall 13 a and the inner wall 13 b. Are formed. The case 13 has a pin receiving groove 16 for receiving the pin 12 so as to pass through the center of the case 13 and cross the switching vane receiving groove 15. The pin receiving groove 16 has a long cross-section along the axial direction of the valve port 3, and the bottom is an intermediate bottom 13 c which forms the bottom of the switching vane receiving groove 15. It is more deeply formed. The outer peripheral surface of the case 13 is provided with a hydraulic pressure supply port 13 e for supplying hydraulic pressure from one surface of the communication wall 13 d to the switching vane accommodating groove 15. Further, an annular spring accommodating groove 18 for accommodating a spring 17 to be described later is formed below the intermediate bottom portion 13c of the case 13 as shown in FIG.

The switching vane 14 as a rotatable rotating member is accommodated in the switching vane accommodating groove 15 of the case 13 as shown in FIG. The switching vane 14 has a shape in which a part of a substantially donut-shaped member is cut out, and one end surface 14 a of the switching vane 14 can be close to one surface of the communication wall 13 d. A return spring 19, which is a coil spring that urges both surfaces in a direction to separate them, is provided between the other one end surface 14b and the other surface of the communication wall 13d. Further, the lower edge 14 c of the switching vane 14 is located at a point symmetrical position with respect to the center on the axis of the switching vane 14, and the inner casing 10 and the outer casing 10 are located at a point symmetrical position. A pair of recesses 20 for accommodating pins 12 as means for connecting the sockets 11 are formed. The body 10b of the inner socket 10 is housed coaxially inside the inner peripheral wall 13b of the case 13, and the inner socket 10 is a valve port. It can reciprocate in the axial direction of the pad 3. A disk-shaped holding plate 21 is fixed to the lower edge of the body 10 b of the inner overnight pet 10, and a cam profile and a sunset are provided at the bottom center of the body 10 b. A shim 22 is fixed as a clearance adjusting member of the ヅ. In addition, an internal combustion engine (not shown) is operated in a low rotation range between the lower side of the middle bottom 13 c of the case 13 and the holding plate 21 fixed to the inner unit 10. Spring 1 to follow the operation of the high-lift cam 6 to prevent the occurrence of abnormalities.

17 are arranged.

As shown in Fig. 1, between the annular holding plate 3a provided at the upper end of the valve port 3 and the spring receiving surface 1b of the cylinder head 1, Always urge the valve port 3 in the direction to close the valve 2 fixed to the lower end of the valve 3 so that the inner port 10 coaxially connected to the valve 3 or only the inner port 10 A spring 23 is provided to allow the outer sunset 11 integrated with the sunset 10 to contact the upper lift cam 5 or the higher lift cam 6 during valve lift. Have been. In FIG. 2, reference numeral 24 denotes the hydraulic pressure from a hydraulic pump (not shown) that is switched through the hydraulic supply port 1 le of the outer sunset 11 and the hydraulic supply port 13 e of the case 13. A hydraulic port for supplying the space between one end surface 14a of the switching vane 14 housed in the shaft housing groove 15 and the connecting wall 13d, inside the cylinder head 1. Is provided. Further, the inner peripheral surface of the cylindrical hole 1a in the cylinder head 1 is engaged with the tip of the bin 12 projecting from the through hole 11d of the outer sunset 11 at a position facing each other. A pair of detent grooves 25 for restricting free rotation are formed in the cylindrical hole 1a of the outer set 11 and the inner set 10 in the above. Next, the operation will be described. -First, when the internal combustion engine (not shown) is operated in the low rotation range, the return spring 19 is attached as shown in Fig. 3 by the control signal of the control device (not shown). One end face 14 b of the switching vane 14 is pressed by the force along the switching vane receiving groove 15 in the case 13, and the one end face 14 a of the switching vane 14 is connected. The switching vane 14 is rotated in the circumferential direction of the case 13 until it comes into contact with one surface of the wall 13 d. In this rotated state, the recess 20 of the switching vane 14 is located above the pin receiving groove 16 of the case 13, and the pin 12 disposed in the pin receiving groove 16 is Reciprocation between 20 and the pin receiving groove 16 is enabled. In this case, the switching vane 14 allows relative movement between the inner sunset 10 and the outer sunset 11 within the movement range of the pin 12.

Here, as shown in FIG. 6 (a), the part of the pace circle 7 in the cam profile of the low lift cam 5 abuts on the top 10a of the inner set 10 and the no. The base circle 7 of the cam profile of the lift cam 6 is in contact with the upper surface 1 lb of the outer sunset 11. Next, as shown in FIGS. 6 (b), 6 (c) and 7 (a) to 7 (c), when the cam shaft 4 rotates, the mouth lift cam 5 and the high Each cam profile of the lift cam 6 slides on the top 10 a of the inner set 10 and on the upper surface 1 lb of the outer set 11.

Here, the inner set 10 is gradually changed in relation to the outer set 11 according to the cam profile of the low lift cam 5 due to the stroke difference between the cam profiles of the cams 5 and 6. While rising relatively, the outer sunset 11 falls relatively in relation to the inner sunset 10 according to the cam profile of the high lift cam 6. That is, in the low rotation range, as shown in FIGS. 8 and 9, the cam lift The valve lift is absorbed by the cam profile of the mouth lift cam 5 for the valve 2 by absorbing the head lift by the spring 17. Next, the internal combustion engine (not shown) When the engine is operated in a high rotation range, the hydraulic pressure is changed from the state shown in FIG. 3 to the hydraulic pressure as shown in FIGS. 11 and 12 by a control signal of a control device (not shown). The switching lever accommodated in the switching blade receiving groove 15 is switched from the port 24 through the hydraulic supply port 11 e of the outer socket 11 and the hydraulic supply port 13 e of the case 13. By supplying hydraulic pressure to the space between one end surface 14a of the valve 14 and the connecting wall 13d, the switching vane 14 is switched against the urging force of the return spring 19 Rotate in one direction (arrow A direction) in the circumferential direction of the case 13 in the vane receiving groove 15 to connect the one end face 14 b of the switching vane 14 It is close to the other side of the wall 1 3 d. At this time, a part of the outer peripheral surface of the rod 12 b of the pin 12 is displaced from the concave portion 20 of the switching vane 14 and contacts the lower edge 14 c of the switching vane 14. In this state, the switching vane 14 locks the inner and outer sockets 10 and 11 via the pins 12 and integrates both the outer and upper sockets. .

Next, as shown in FIGS. 13 (a) to 13 (c) and FIGS. 14 (a) to 14 (c), when the camshaft 4 is rotated, the inner shaft is closed. Since the inner and outer pets 11 and 11 are integrated, the inner night 10 does not operate according to the cam profile of the mouth lift cam 5, and the outer night 1 Operates according to the high lift cam 6 cam profile. That is, in the high rotation range, as shown in FIG. 10, the cam profile of the mouth-to-lift cam 5 is not transmitted to the inner portion 10 and the high-lift cam for the valve 2 is not transmitted. Only the lift by the cam profile of 6 is executed. Next, when the operation of the internal combustion engine (not shown) is switched from the high rotation region to the low rotation region, the hydraulic pressure supplied to the switching vane housing groove 15 is reduced, and the re- gion spring 1 By rotating the switching vane 14 in the other circumferential direction of the case 13 (the direction opposite to the arrow A direction shown in FIG. 12) by the urging force of 9, one end face of the switching vane 14 is rotated. 14a is brought into contact with one surface of the communication wall 13d, and the state shown in Fig. 6 (a), that is, the recess 20 of the switching vane 14 and the pin 12 are snapped inward. 10 and the outer sunset 11 are arranged along the axial direction of the outer sunset 11, so that the inner 10 and outer 11 can be slid in the axial direction. return.

As described above, according to the first embodiment, since the pin 12 as the rod-shaped member and the switching vane 14 as the rotating member are provided, the structure is simpler than that of the conventional valve lift adjusting device. Since the head of valve 2 in the low rotation region and the head of valve 2 in the high rotation region can be easily switched, the operation reliability and stability of each component can be improved.

In the first embodiment, the switching vane 14 is a donut-shaped member having a notch in a part, but may be at least one arc-shaped member.

In the first embodiment, the return spring 19 is a coil spring. However, a torsion spring may be used.

Further, in the first embodiment, the rod 12 b of the pin 12 abutting on the lower edge 14 c of the switching vane 14 has a cylindrical shape, but the rod 12 b has a cylindrical shape. The contact between the pin 12 and the switching vane 14 may be stabilized by making the contact portion a flat surface. In this case, the rod 12b may have a substantially D-shaped or square cross section, but the present invention is not limited to these shapes.

In the first embodiment, hydraulic pressure is applied to the rotation of the switching vane 14. Although hydraulic pressure was used, the invention is not limited to hydraulic pressure and is not particularly limited as long as it is a pressure transmission medium. Embodiment 2

FIG. 15 is a longitudinal sectional view of a valve lift adjusting device according to Embodiment 2 of the present invention. Components of the second embodiment that are common to the components of the first embodiment are denoted by the same reference numerals, and the description of those components is omitted.

The feature of the second embodiment is that a spring receiving surface 1c is provided outside the spring receiving surface 1b of the cylinder head 1, and a gap between the spring receiving surface 1c and the bottom of the case 13 is provided. The second embodiment is different from the first embodiment in that a permissible space having a longer stroke than that of the first embodiment is provided, and a spring 17 having a larger diameter than that of the first embodiment is disposed in the permissible space.

In the first embodiment, the load of the spring 17 cannot be sufficiently taken within the allowable space, and surging may occur in the outer sunset 11. On the other hand, in the second embodiment, as shown in FIG. 15, a configuration in which the spring 17 is accommodated in an allowable space having a longer stroke than in the first embodiment is employed. As a result, the load of the spring 17 can be sufficiently taken in the permissible space, so that the occurrence of the above-mentioned surge can be prevented. Embodiment 3.

FIG. 16 is a cross-sectional view of a valve lift adjusting device according to Embodiment 3 of the present invention. Among the components of the third embodiment, the same components as those of the first embodiment are denoted by the same reference numerals, and the description of those components is omitted. The feature of the third embodiment is that the switching vane 14 is rotated in the direction of arrow B together with the return spring 19 used in switching the operating condition from the high rotation range to the low rotation range in the first embodiment. There is a point that uses hydraulic pressure. That is, as shown in FIG. 16, a second hydraulic supply port 11 f is provided on the outer peripheral surface of the outer socket 11, and a connecting wall is provided on the outer peripheral surface of the case 13.

A second hydraulic supply port 13 f communicating with the switching vane receiving groove 15 on the other surface side of the 13 d is provided, and the second hydraulic supply port 13 f and the outer A hydraulic supply path 13 g is provided to communicate between the hydraulic supply port 11 f and the outer peripheral position of the case 13.

As described above, in the third embodiment, the configuration in which the switching vane 14 is moved by the mechanical urging force and the hydraulic pressure is employed.

The hook for the pin 12 of 4 and the release of this hook can be smoothly performed. In addition, even if an event occurs and hydraulic pressure is not supplied, switching to a safe direction can be performed by mechanical biasing force. Embodiment 4.

FIG. 17 is a longitudinal sectional view of a valve lift adjusting device according to Embodiment 4 of the present invention, and FIG. 18 is a plan view showing the appearance of the valve lift adjusting device shown in FIG. 1. FIG. 19 is a cross-sectional view taken along the line XIX-XIX of FIG. The same components as those of the first embodiment among the components of the fourth embodiment are denoted by the same reference numerals, and the description of those components will be omitted.

The feature of the fourth embodiment is that the cam profile of the mouth lift cam 5 when the lift of the mouth lift cam 5 is maximized becomes the top 10 a of the inner set 10. In order to avoid abutment at the periphery of the inner cam, the periphery of the top 10a of the inner cover 10 is outside the orbit of the cam profile of the mouth lift cam 5 and the low lift cam 5 At a point set apart from You.

That is, in the fourth embodiment, as shown in FIGS. 17 to 19, as a sliding-resistant member which is slid by the low lift cam 5 on the upper part of the inner shaft 10. Guide shims 26 are detachably attached. The guide shim 26 includes a sliding part 26 a extending parallel to the raceway surface of the cam profile of the low lift cam 5 and orthogonal to the axial direction of the cam shaft 4, and a sliding part 26 a. A base 26b is located at the lower center and is fitted to a recess 10d formed in place of the top 10a in the upper portion of the inner housing 10 instead of the top 10a. The upper surface of the sliding portion 26a is a sliding surface 26c which is slid by the low lift cam 5, and the sliding surface 26c is orthogonal to the axial direction of the force shaft 4. It has a long rectangular shape extending in the direction of For this reason, the short side edge of the sliding surface 26 c is located outside the orbit of the cam profile of the mouth lift cam 5, and is brought into contact with the mouth lift cam 5. There is no.

Therefore, in the fourth embodiment, the mouth lift cam 5 can be prevented from contacting the peripheral portion of the top 10a of the inner set 10 and the inner lift cam 5 can be prevented. Smooth sliding with respect to the unit 10 can be guaranteed.

In the fourth embodiment, the lower part of the sliding part 26 a of the guide shim 26 is accommodated in the accommodation groove 1 lg formed in the upper surface 1 lb of the outer sunset 11, It substantially covers a portion of the upper surface 11b of the outer sunset 11 that is separated from the contact surface that receives the sliding of the high lift cam 6. In this case, when the guide shim 26 rotates to the high cam track due to some phenomenon, smooth sliding by the low cam cannot be performed. As a rotation position regulating means for avoiding this state, use members such as pins and keys, or splines and selections. However, the present invention is not limited to these.

Further, in the fourth embodiment, the sliding surface 26 c of the guide shim 26 protrudes upward from the upper surface 1 lb of the aperture 11. In this case, by using the thickness of the sliding portion 26a so that the base circle diameter can be changed by the high lift cam and the mouth lift cam, the degree of freedom of the thickness of the sliding portion 26a is increased. Can increase. Embodiment 5

FIG. 20 is a sectional view showing a rotating member in the valve lift adjusting device according to Embodiment 5 of the present invention. FIG. 21 allows the rotating member shown in FIG. 20 to rotate. FIG. 22 is a cross-sectional view showing the holder, FIG. 22 is an enlarged cross-sectional view of the holder shown in FIG. 21, and FIG. 23 is a cross-sectional view showing a state where the engagement is released. FIG. 20 is a sectional view taken along the line XXIII-XXIII of FIG. 20 showing the rotating member and the protruding member in the valve lift adjusting device shown in FIG. 0, and FIG. 24 is a locked state of FIG. FIG. 5 is a cross-sectional view showing a rotating member and a protruding member in the valve lift adjusting device shown in FIG. Among the constituent elements of the fifth embodiment, those that are common to the constituent elements of the first embodiment are denoted by the same reference numerals, and descriptions of those parts are omitted.

The feature of the fifth embodiment is that a stopper pin receiving surface 30 for locking the pin 12 is provided in a part of the concave portion 20 of the rotating member. That is, in the first embodiment and the like, the lower edge 14 c of the switching vane 14, which is the sliding surface of the rotating member, is made to function as the stop pin receiving surface, but in the fifth embodiment, The sliding surface of the rotating member and the stopper pin receiving surface are separated. As a result, operation reliability can be improved.

In the fifth embodiment, the holder 31 that allows the rotation of the rotating member has a simple shape in consideration of workability as shown in FIGS. 21 and 22. It has a bin shape, and penetrates through the cylindrical portion 3 la and the rotary member receiving groove 31 b formed along the outer peripheral surface of the cylindrical portion 31 a to receive the rotary member and the cylindrical portion 31 a. And a pin accommodation groove 31 c that is formed in the axial direction and is long in the axial direction. Inside the cylindrical portion 31 a of the holder 31, an inner ring 10 is accommodated so as to be slidable in the axial direction. A spring retainer 32 having a U-shaped cross section is provided at the peripheral edge of the bottom surface of the holder 31. In the spring retainer 32, the rotating member is turned against hydraulic pressure. A return spring 19, which is a torsion spring for urging the moving member, is housed therein.

In the fifth embodiment, as shown in FIGS. 23 and 24, the rotating member is composed of two sector-shaped switching vanes 33 and 34, and Accordingly, the oil receiving surface is larger than in the first embodiment. Therefore, responsiveness to hydraulic pressure can be improved.

Next, the operation will be described.

First, when an internal combustion engine (not shown) is operated in a low rotation speed region, as shown in FIG. 23, the housing groove 3 lb of the holder 31 and the inner wall surface of the outer sunset 11 are in contact with each other. Since no hydraulic pressure is supplied during this time, the switching vanes 33 and 34 are rotated in the direction of arrow A by the biasing force of the return spring 19, and the switching vane 34 is stopped. It is brought into contact with one wall surface 35 a of the hood 35. In this state, the pins 12 are free in the recess 20 of the switching vane 33. In this free state, the inner pet 10 and the outer pet 11 are free. Means that relative sliding in the axial direction is permitted.

Next, when the internal combustion engine (not shown) is operated in a high rotation range, as shown in FIG. 24, the housing groove 3 lb of the holder 31 and the inner wall surface of the outer housing 11 are connected to each other. During this time, the hydraulic pressure is supplied from the hydraulic pressure supply port 11 e, and the switching vanes 33 and 34 are moved in the direction of arrow B against the biasing force of the return spring 19. By rotating, the pin 12 is engaged with the stopper pin receiving surface 30 formed in a part of the recess 20. In this locked state, relative sliding in the axial direction between the inner pet 10 and the inner pet 11 is restricted.

As described above, according to the fifth embodiment, the stopper pin receiving surface 30 is provided in a part of the concave portion 20. Therefore, as in the first embodiment and the like, the bin 12 is rotated by the sliding member. It is not necessary to put on the moving surface (lower edge 14 c), and the dimension L can be reduced by at least the length corresponding to the diameter of the pin 12, and the weight can be reduced.

In the fifth embodiment, the rotating member is divided into two fan-shaped switching vanes 33 and 34. However, the rotating member may be singular or may be divided into three or more. Good. Industrial applicability

As described above, the valve lift adjusting device according to the present invention is used at the same time as the valve opening / closing timing adjusting device, etc., in order to achieve low fuel consumption and high output of the internal combustion engine, compared to the case where it is used alone. Effective control can be performed.

Claims

The scope of the claims .

1. Out of a plurality of cams provided on a camshaft that is driven to rotate in synchronization with the rotation of the internal combustion engine, the inner biased toward the lowlift cam that is used to open and close the valve in lowlift mode. An outer set provided outside the inner set and biased toward a high-lift cam that is involved in opening and closing a valve in a high-lift mode among the plurality of cams; Relative to the protruding member protruding at least at one or more locations on the outer circumference of the inner set and the inner set and the inner set and the outer set. A rotating member operable and having an engagement portion with the protruding member, wherein the rotation of the rotating member in a predetermined range causes the inner and outer sets to be connected to each other. The feature is to regulate or allow relative sliding in the axial direction. Valve lift adjustment device.

2. The valve lift adjusting device according to claim 1, wherein the protruding member is a rod-shaped member protruding from an outer periphery of the inner socket.

3. The rod-shaped member penetrates radially through the inner cover, and at least one end face is radially outside the inner cover from the outer peripheral surface of the inner cover. 3. The valve lift according to claim 2, wherein the valve lifts

4. The valve lift according to claim 1, wherein the rotating member is movable in one circumferential direction of the inner one and the outer one by hydraulic pressure. Adjustment device.

5. The valve according to claim 4, wherein the rotating member is movable in the other circumferential direction of the inner and outer sunsets by a mechanical biasing force. Head adjustment device.

6. The valve lift adjustment according to claim 1, wherein the rotating member is movable in both circumferential directions of the inner and outer sunsets by hydraulic pressure. apparatus.

7. The valve lift adjusting device according to claim 1, wherein the rotating member has a concave portion that engages with the projecting member.

8. The valve lift adjusting device according to claim 1, wherein the projecting member has a flat surface as a contact surface with the rotating member.

9. At least one end of the protruding member protrudes radially outward from the outer sunset from the outer peripheral surface of the outer sunset and slidably supports the outer sunset. 2. The valve lift control according to claim 1, wherein the valve head is engaged with a groove formed in a sliding direction of an inner peripheral surface of a circumferential hole of the cylinder head.

10. The edge of the contact surface of the inner pet with the mouth lift cam is outside the track of the cam profile of the low lift cam and is separated from the mouth lift cam. The valve lift adjusting device according to claim 1, wherein the valve lift adjusting device is provided at a position.

11. The rotating member according to claim 1, wherein the rotating member has a sector shape, and at least one or more rotating members are disposed in a bobbin-shaped holder and held so as to be rotatable in a circumferential direction. Valve lift adjustment device.

12. A valve lift according to claim 11, wherein a stopper for restricting a rotation range of the rotation member is provided in a part of a groove of the holder having a bobbin shape. Adjustment device.

13. The valve lift adjusting device according to claim 11, further comprising a torsion spring for urging the rotating member in one circumferential direction.

14. An inner set having a contact surface with a low lift cam and a detachable sliding-resistant member provided on the inner set. The valve lift adjusting device according to claim 1, wherein:

15. The anti-sliding member covers a part of the outer sunset separated from a contact surface of the outer sunset with the high lift cam. The valve lift adjusting device as described in the above.

16. The anti-sliding member is accommodated in a groove formed in a part of the outer sunset separated from the contact surface of the outer pet with the high lift cam, and the anti-sliding member is also provided. 15. The valve lift according to claim 14, wherein the contact surface of the moving member is flush with the contact surface of the outer sunset with the high lift cam.

7. Provided on a cam shaft that is driven to rotate in synchronization with the rotation of the internal combustion engine Out of the plurality of cams, an inner ring biased toward a mouth lift cam involved in opening and closing a valve in a low-lift mode, and an outer side of the inner ring. An outer sunset provided and urged toward a high-lift cam involved in opening and closing the valve in a high-lift mode of the plurality of cams; a lift by the low-lift cam; A rod-shaped member which permits relative displacement of the inner set and the outer set in the axial direction within a stroke corresponding to a difference between the lift and the lift by the lift cam; The rod moves in one circumferential direction of the inner set and the outer set to lock the rod-shaped member, and the inner set and the outer set are moved in the axial direction. A rotating member for integrally moving the Valves, characterized in that a hydraulic mechanism for provided outside the pet bets and by the rotating member to release the lock and the lock of the rod-shaped member